package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.OrderTo;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.apache.commons.lang.StringUtils;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;

import javax.print.attribute.standard.MediaSize;

@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

   @Autowired
   WareSkuDao wareSkuDao;
   @Autowired
    ProductFeignService  productFeignService;

   //订单的远程服务
    @Autowired
    OrderFeignService  orderFeignService;

   //订单锁定发送消息
    @Autowired
   RabbitTemplate rabbitTemplate;

    //订单工作单业务
    @Autowired
    WareOrderTaskService orderTaskService;

    //订单详情业务
    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;


    /**
     * 解锁库存
     */
    private void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId){
        //解锁库存数据访问
        wareSkuDao.unlockStock(skuId,wareId,num);
        //工作单
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        //设置id
        entity.setId(taskDetailId);
        //设置解锁状态
        entity.setLockStatus(2);//变为已解锁
        //更新
        orderTaskDetailService.updateById(entity);
    }

    /**
     * skuId: 28
     * wareId: 1
     * @param params
     * @return
     */
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if(!StringUtils.isEmpty(skuId)){
            queryWrapper.eq("sku_id",skuId);
        }
        String wareId = (String) params.get("wareId");
        if(!StringUtils.isEmpty(wareId)){
            queryWrapper.eq("ware_id",wareId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if(entities==null || entities.size() ==0){
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字,如果失败，整个事务无需回滚
            //1、自己catch异常
            //TODO 还可以用什么办法让异常出现以后不回滚?
            try{
                R info = productFeignService.info(skuId);
                Map<String, Object> skuInfo = (Map<String, Object>) info.get("skuInfo");

                if(info.getCode() == 0){
                    skuEntity.setSkuName((String) skuInfo.get("skuName"));
                }
            }catch (Exception e){

            }
            skuEntity.setSkuName("");
            wareSkuDao.insert(skuEntity);
        }else{
            wareSkuDao.addStock(skuId,wareId,skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo>  getSkuHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();

            //查询当前sku的总库存量
            //SELECT SUM(stock-stock_locked) FROM `wms_ware_sku` WHERE  sku_id=29;
            Long count = baseMapper.getSkuStock(skuId);
            vo.setSkuId(skuId);
            vo.setHasStock(count==null?false:count>0);
            return vo;
        }).collect(Collectors.toList());
        return collect;
    }

    /**
     * 库存锁定
     *抛出异常 ,回滚
     * (rollbackFor = NoStockException.class)
     * 默认只要是运行时异常都会回滚
     * @param vo
     *
     * 库存解锁的场景
     * 1).下订单成功,订单过期没有支付被系统自动取消,被用户手动取消.都要解锁库存
     * 2).下订单成功,库存锁定成功,接下来的业务调用失败,导致订单回滚.
     *    之前锁定的库存就要自动解锁
     * @return
     */
    @Transactional(rollbackFor = NoStockException.class)
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {
        /**
         * 保存库存工作单的详情
         * 追溯
         */
        //工作单
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        //封装订单号
        taskEntity.setOrderSn(vo.getOrderSn());
        //保存
        orderTaskService.save(taskEntity);
        //1.按照下单的收货地址,找到一个就近仓库,锁定库存.
        //2.找到每个商品在哪个仓库都有库存
        //获得仓库
        List<OrderItemVo> locks = vo.getLocks();
        //转换数据
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            //封装
            SkuWareHasStock stock = new SkuWareHasStock();
            //获得skuId
            Long skuId = item.getSkuId();
            //封装
            stock.setSkuId(skuId);
            //查询这个商品在那里有库存
            //封装锁定数量
            stock.setNum(item.getCount());
            //查询库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            //返回
            return stock;
        }).collect(Collectors.toList());//返回List

        //2.锁定库存
        for (SkuWareHasStock hasStock : collect) {
            //商品没有被锁住
            Boolean skuStocked = false;
            //获得skuId
            Long skuId = hasStock.getSkuId();
            //获得wareId
            List<Long> wareIds = hasStock.getWareId();
            //没有任何仓库有这个商品的库存
            if(wareIds==null || wareIds.size()==0){
                //库存不足
                throw new NoStockException(skuId);
            }
            //逐个扣减仓库
            for (Long wareId : wareIds) {
                //成功就返回1,否则0
                //锁定库存
                Long count = wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                //1.如果每一个商品都锁定成功,将当前商品锁定了几件的工作单记录发给MQ
                //2.锁定失败.前面保存的工作单信息就回滚了.发送出去的消息,即使要解锁记录,由于去数据库查不到id,所以就不用解锁了
                //    1:1 -2 -1 2:2-1-2 3:3-1-1(x)
                //如果成功
                if(count == 1){
                    //商品被锁住
                    skuStocked = true;
                    //TODO 告诉MQ库存锁定成功
                    //生成订单详情,用于保存锁成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, null, hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    //保存
                    orderTaskDetailService.save(entity);
                    //生成库存锁定传输消息
                    StockLockedTo lockedTo = new StockLockedTo();
                    //封装工作单id
                    lockedTo.setId(taskEntity.getId());
                    //工作详情传输对象
                    StockDetailTo stockDetailTo = new StockDetailTo();
                    //对象拷贝
                    BeanUtils.copyProperties(entity,stockDetailTo);
                    //只发id不行,防止回滚以后找不到数据
                    lockedTo.setDetail(stockDetailTo);


                    //发送消息给交换机
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    //结束
                    break;
                }else {
                    //当前仓库锁失败,重试下一个仓库
                }
            }
            //如果商品在所有仓库都没有所致
            if(skuStocked==false){
                //库存不足
                throw new NoStockException(skuId);
            }
        }
        //3.肯定全部都是锁定成功的
        //返回
        return true;
    }

    @Override
    public void unlockStock(StockLockedTo to) {

        //库存工作单的id
        //库存详情
        StockDetailTo detail = to.getDetail();
        //库存详情工作单id
        Long detailId = detail.getId();
        //解锁
        //1.查询数据库关于这个订单的锁定库存信息
        // 有:证明库存锁定成功了
        //  解锁:订单情况
        //      1.没有这个订单.必须解决
        //      2.有这个订单,不解锁库存
        //          订单状态:已取消:解锁库存
        //                  没取消,不能解锁
        // 没有:库存锁定失败了,库存回滚了.这种情况无需解锁
        //查询工作单详情
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailId);
        //如果有
        if(byId!=null){
            //解锁
            //库存工作单唯一标识
            Long id = to.getId();
            //查询工作单
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            //得到订单号
            String orderSn = taskEntity.getOrderSn();//根据订单号查询订单的状态
            //订单状态
            R r = orderFeignService.getOrderStatus(orderSn);
            //如果成功
            if (r.getCode() == 0) {
                //转出数据
                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });
                //如果订单不存在或被取消
                if(data == null || data.getStatus()==4){
                    //订单已经被取消了.才能解锁库存

                    //detailId
                    //如果状态不是已解锁
                    if(byId.getLockStatus() == 1){
                        //当前库存工作单详情,状态1,已锁定但是未解锁才可以解锁
                        //解锁库存
                        unLockStock(detail.getSkuId(),detail.getWareId(),detail.getSkuNum(),detailId);
                    }
                }
            }else{//否则,失败
                //抛出异常,重新解锁
                throw new RuntimeException("远程服务失败");
            }

        }else {//否则,没有
            //无需解锁
        }
    }

    //防止订单服务卡顿,导致订单状态消息一直改不了,库存消息优先到期.查订单状态新建状态,什么都不做就走了
    //导致卡顿的订单,永远不能解锁库存
    //解锁库存
    @Transactional
    @Override
    public void unlockStock(OrderTo orderTo) {
        //获取订单号
        String orderSn = orderTo.getOrderSn();
        //查一下最新库存的状态,防止重复解锁库存
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        //库存工作单id
        Long id = task.getId();
        //按照工作单找到所有 没有解锁的库存,进行解锁
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>()
                .eq("task_id", id)
                .eq("lock_status", 1));
        //遍历
        for (WareOrderTaskDetailEntity entity : entities) {
            //解锁
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }

    }

    /**
     * 查询库存
     */
    @Data
    class SkuWareHasStock{
        // 商品id
        private Long skuId;
        // 商品库存量
        private Integer num;
        // 仓库id
        private List<Long> wareId;
    }

}